<script>
// define a simple associative array
var bookNames =
{
"AJAX_PHP" : "AJAX and PHP: Building Modern Web Applications",
"ASP_AJAX" : "Microsoft AJAX Library Essentials",
"SEO_PHP" : "Professional Search Engine Optimization with PHP"
};

// display the value of the AJAX_PHP element
alert(bookNames.AJAX_PHP);
</script>